Isolating listening apparatus



A. BLOCH.

ISOLATING LISTENING APPARATUS.

APPLXCATION HLED JUNE 24,1918. RENEWED NOV. 26. 1920.

Inventor.

Patented J an. 4, 1921.

UNITED STATES ANDRE IBLOCH,

OF PARIS,

FRANCE.

ISOLATING LISTENING APPARATUS.

Application filed June 24, 1918, Serial No. 241,682.

To all whom it may concern:

Be it known that I, ANDRE BLooH, a citizen of the French Republic, residing at Paris, France, have invented certain new and useful Improvements in Isolating Listening Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention has for its object an appa ratus which permits of an observer seeking and listening for a definite noise, isolating it from extraneous noises and also isolating the same from the noise arriving from the object studied when this noise reaches the observer, through a channel other than that of the listening system employed. This apparatus is intended for use in listening posts and for defense against aircraft, in mine warfare, in submarine warfare, in telegraphic and telephonic installations, in medical auscultation in the investigation of suspected noises, as well as all military and industrial applications in which an observer is isolated from all extraneous noises, in order that the observer may hear not only the sound which interests him, and of which the nature, as well as the direction can be easily discovered, but that he will hear this sound only.

The apparatus essentially comprises an adapter for the ears of the listener which isolates the auditory system as well as those parts of the cranium which are most sensi tive to sound.

The accompanying drawing illustrates an apparatus in accordance with the present invention.

Figure 1 is a front view of an operator equipped with the apparatus. Fig. 2 is a side view. Fig. 3 shows the ear projecting between two pads on which the ear rests.

The auditory plugs or buttons 1 situated Specification of Letters Patent.

Patented Jan. 4, 1921.

Renewed November 26, 1920. Serial No. 426,606.

at the ends of the listening tubes 2 are connected to the listening apparatus in any suitable and convenient manner for example by rubber tubes, are supported by pneumatic cushions 3 formed of rubber and capable of being inflated through the tap or cook and tube 4.

The pneumatic cushions 3 are provided around the ear with pads or small cushions 5 and 6 extending forward of the temples and behind the seat of the ear in contact with the head over a sufliciently large area to insure not only an intimate contact with the head but also to muffle or deaden as com pletely as possible this part of the head which is extremely sensitive to sounds.

For the same reason the face of the operator and the upper part of the cranium are provided with similar cushions or small pads.

The whole arrangement is maintained in place by straps or bands 7 and 8, and by a chin strap and supplementary straps provided with adjusting buckles. u

The invention may be modified by the additional provision of cushions or small pads where desired or deemed necessary by the operator.

I claim Isolating listening apparatus comprising pads arranged to contact with the head beneath the ear, encircling the ear and the base thereof, pneumatic cushions carried by said pads, auditory buttons supported by the cushions, pads arranged to pass over the head and around the forehead of the user and means for securing the pads and cushions in the relation specified.

In testimony whereof I afiix my signature, in presence of two witnesses.

ANDRE BLOOH.

Vitnesses CHARLES F EHRENBACH, CHAs. P. PRESSLY. 

